/***********************************************************************************************
  Open source now...
  Function: Compass Desktop App via sensors
  Author: Modified by Tody Guo
  Date: 2016/05/03
  Source: Micrsoft sensor samples and GCC OpenGL samples...
  GPL: v2.0
************************************************************************************************/
#include "stdafx.h"
#include "winCompass.h"
#include "CSensorEvents.h"
#include "CSensorManagerEvents.h"
#include <Windows.h>
#include <gl/GL.h>
#include <gl/GLU.h>

#pragma comment(lib, "Sensorsapi.lib")
#pragma comment(lib, "opengl32.lib")
#pragma comment(lib, "glu32.lib")

/**************************
 * Function Declarations
 *
 **************************/
LRESULT CALLBACK WndProc (HWND hWnd, UINT message,WPARAM wParam, LPARAM lParam);
void EnableOpenGL (HWND hWnd, HDC *hDC, HGLRC *hRC);
void DisableOpenGL (HWND hWnd, HDC hDC, HGLRC hRC);
int getSensors(int sType);
CSensorManagerEvents* m_pSensorManagerEvents;
#define MAX_CHAR        128

HWND hWnd;
HDC hDC;
HGLRC hRC;

int getSensors(int sType)
{
	m_pSensorManagerEvents = new CSensorManagerEvents();
	if (SUCCEEDED(m_pSensorManagerEvents->Initialize()))
		return 0;
	else
		return 1;
}

void drawString(const char* str) {
    static int isFirstCall = 1;
    static GLuint lists;

    if( isFirstCall ) {
         isFirstCall = 0;
         lists = glGenLists(MAX_CHAR);
         wglUseFontBitmaps(wglGetCurrentDC(), 0, MAX_CHAR, lists);
     }
    for(; *str!='\0'; ++str)
         glCallList(lists + *str);
}

void glPrint(char *str, HDC hDC)
{
	glColor3f(1.0f, 0.0f, 0.0f);
    glRasterPos2f(0.0f, 0.0f);
    drawString(str);
    SwapBuffers(hDC);
}

void DrawGraphics(float angle)
{
           /* OpenGL animation code goes here */
            glClearColor (0.0f, 0.0f, 0.0f, 0.0f);
            glClear (GL_COLOR_BUFFER_BIT);
            glPushMatrix ();
			glRotatef (angle, 0.0f, 0.0f, 1.0f);			
			//glPrint("Test", hDC);			
            glBegin (GL_TRIANGLES);
            	glColor3f (1.0f, 0.0f, 0.1f);   glVertex2f (0.0f, 0.9f);glVertex2f (-0.3f, 0.0f); glVertex2f (0.3f, 0.0f);
            	glColor3f (0.0f, 0.0f, 1.0f);   glVertex2f (0.0f, -0.9f);glVertex2f (-0.3f, 0.0f); glVertex2f (0.3f, 0.0f);
            glEnd ();
            glPopMatrix ();
            SwapBuffers (hDC);
}

/**************************
 * WinMain                *
 **************************/

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int iCmdShow)
{
    WNDCLASS wc;        
    MSG msg;
    BOOL bQuit = FALSE;
    /* register window class */
    wc.style = CS_OWNDC;
    wc.lpfnWndProc = WndProc;
    wc.cbClsExtra = 0;
    wc.cbWndExtra = 0;
    wc.hInstance = hInstance;
    wc.hIcon = LoadIcon (NULL, IDI_APPLICATION);
    wc.hCursor = LoadCursor (NULL, IDC_ARROW);
    wc.hbrBackground = (HBRUSH) GetStockObject (BLACK_BRUSH);
    wc.lpszMenuName = NULL;
    wc.lpszClassName = TEXT("GLCOMPASS");
    RegisterClass (&wc);

    /* create main window */
    hWnd = CreateWindow (
      TEXT("GLCOMPASS"), TEXT("OpenGL Compass"), WS_CAPTION | WS_POPUPWINDOW | WS_VISIBLE, 0, 0, 400, 400,
      NULL, NULL, hInstance, NULL);

    /* enable OpenGL for the window */
    EnableOpenGL (hWnd, &hDC, &hRC);

	getSensors(0);
    while (!bQuit){
		//DrawGraphics(360);
        if (PeekMessage (&msg, NULL, 0, 0, PM_REMOVE)){
            if (msg.message == WM_QUIT){
                bQuit = TRUE;
            }
            else{
                TranslateMessage (&msg);
                DispatchMessage (&msg);
            }
        }
    }
    DisableOpenGL (hWnd, hDC, hRC);
    DestroyWindow (hWnd);
    return msg.wParam;
}

/********************
 * Window Procedure *
 ********************/
LRESULT CALLBACK WndProc (HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message){
		case WM_CREATE:
		    return 0;
		case WM_CLOSE:
		    PostQuitMessage (0);
		    return 0;
		case WM_DESTROY:
		    return 0;
		case WM_KEYDOWN:
		    switch (wParam){
		    case VK_ESCAPE:
		        PostQuitMessage(0);
		        return 0;
		    }
		    return 0;
		default:
			return DefWindowProc (hWnd, message, wParam, lParam);
    }
}

/*******************
 * Enable OpenGL *
 *******************/
void EnableOpenGL (HWND hWnd, HDC *hDC, HGLRC *hRC)
{
    PIXELFORMATDESCRIPTOR pfd;
    int iFormat;

    /* get the device context (DC) */
    *hDC = GetDC (hWnd);

    /* set the pixel format for the DC */
    ZeroMemory (&pfd, sizeof (pfd));
    pfd.nSize = sizeof (pfd);
    pfd.nVersion = 1;
    pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
    pfd.iPixelType = PFD_TYPE_RGBA;
    pfd.cColorBits = 24;
    pfd.cDepthBits = 16;
    pfd.iLayerType = PFD_MAIN_PLANE;
    iFormat = ChoosePixelFormat (*hDC, &pfd);
    SetPixelFormat (*hDC, iFormat, &pfd);

    /* create and enable the render context (RC) */
    *hRC = wglCreateContext( *hDC );
    wglMakeCurrent( *hDC, *hRC );
}

/******************
 * Disable OpenGL *
 ******************/
void DisableOpenGL (HWND hWnd, HDC hDC, HGLRC hRC)
{
    wglMakeCurrent (NULL, NULL);
    wglDeleteContext (hRC);
    ReleaseDC (hWnd, hDC);
}
